Walk into McDonald's and the self-service kiosks look like a simple upgrade. Faster ordering, fewer queues, more convenience. But from a behavioural psychology and business perspective, they serve a much more strategic purpose. They are designed to influence how customers make decisions and ultimately increase how much they spend.

The smallest size often isn’t designed to be the most popular choice. It acts as a decoy. Its job is to make the medium and large look like better value.

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Apple is known for its sleek and innovative products that captivate consumers across the globe.

The average spend on fast food in the UK is £110 a month and even higher in the US. Here is how fast-food giants get you to spend more.